the PCM tank, and tube solar heat collectors. Intended for demand shifting in space heating and domestic hot water (DHW) applications, the system is reportedly able to achieve a higher coefficient ...

Push the plastic supply tube onto the inlet valve ... Disconnect the tubing at the tank valve. Dump all the water out of the tank. Then, check the air pressure as shown above.

For towns with aging concrete water tanks, the dilemma is usually the same: repair or build new. In repair, re-waterproofing can buy another decade or two so they can budget for the new expense.